[PATCH 10/16] Makefile: move $(comma), $(empty) and $(space) to shared.mak

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Move these variables over to the shared.max, we'll make use of them in
a subsequent commit. There was no reason for these to be "simply
expanded variables", so let's use the normal lazy "=" assignment here.

See 425ca6710b2 (Makefile: allow combining UBSan with other
sanitizers, 2017-07-15) for the commit that introduced these.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 Makefile   | 4 ----
 shared.mak | 8 ++++++++
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index e65d346e7cd..f3ad497fcb1 100644
--- a/Makefile
+++ b/Makefile
@@ -1252,10 +1252,6 @@ endif
 ALL_CFLAGS = $(DEVELOPER_CFLAGS) $(CPPFLAGS) $(CFLAGS)
 ALL_LDFLAGS = $(LDFLAGS)
 
-comma := ,
-empty :=
-space := $(empty) $(empty)
-
 ifdef SANITIZE
 SANITIZERS := $(foreach flag,$(subst $(comma),$(space),$(SANITIZE)),$(flag))
 BASIC_CFLAGS += -fsanitize=$(SANITIZE) -fno-sanitize-recover=$(SANITIZE)
diff --git a/shared.mak b/shared.mak
index 0170bb397ae..2d597ef7603 100644
--- a/shared.mak
+++ b/shared.mak
@@ -7,3 +7,11 @@
 #
 #    info make --index-search=.DELETE_ON_ERROR
 .DELETE_ON_ERROR:
+
+### Global variables
+
+## comma, empty, space: handy variables as these tokens are either
+## special or can be hard to spot among other Makefile syntax.
+comma = ,
+empty =
+space = $(empty) $(empty)
-- 
2.34.0.rc1.741.gab7bfd97031




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